UUIDof the journal whose root block will be returned (optional, defaults to the current Journal).
Note: This parameter is intended for scale-out if there is a need to fetch the root block of a historical journal (versus the live journal).
truethe request should be non-blocking. Otherwise the request should obtain the lock that guards the update of the root block in the commit protocol such that the caller can not observe a root block that has been updated but where the commit protocol is still in its critical section.
Note: The non-blocking form of the request is used in some context where the avoidence of a deadlock is necessary. The blocking form is used in some contexts where we need to await a specific commit point on the service (typically under test suite control).
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